By understanding the conditions for the development of allergic diseases and the role of genetic factors in allergic diseases, it is clear that allergic diseases are not clearly hereditary, but only have a tendency to cluster in families. Many patients develop allergic diseases for the first time after the age of 20 or even 40 years. It can be inferred that the occurrence of such diseases is more closely related to acquired environmental factors, and even so, current medicine can only detect some of the allergens, and the explanation of “why there is an allergy to the substance” is often unsatisfactory. Since we do not know much about the relationship between complex environmental factors and the body’s immune system and the mechanisms by which reactions occur, there is no need to worry too much about the relationship between environmental factors and the immune system. Therefore, there is no need to be overly concerned about passing allergic diseases to one’s offspring. To worry about something we do not know and cannot control is tantamount to “worrying about nothing”.